// Make the table of contents
// Fix the left and right nav so they remain visible while scrolling
// Highlight current section in TOC with ScrollSpy
$(document).ready(function() {
  $('#toc').toc({ listType: 'ul' });

  // Set active item
  var url = window.location.href.split('#')[0];
  $('a').filter(function() {
    return this.href == url;
  }).parent('li').addClass('active-item');

  $('#sidebar').affix({
    offset: {
      top: 110
    }
  });
  $('#tocSidebar').affix({
    offset: {
      top: 110
    }
  });

  var $body = $(document.body);
  var navHeight = $('.navbar').outerHeight(true) + 20;

  $body.scrollspy({
    target: '#rightCol',
    offset: navHeight
  });

});

// Prettyprint
$('pre').addClass("prettyprint");
$.getScript("https://cdn.rawgit.com/google/code-prettify/master/loader/run_prettify.js", function(){
});

// Collapsible side menus
$.getScript("/js/jquery.collapsible.js", function() {
  highlightActive();
  $('.submenu').collapsible();
});

// Add the 'external' class to every outbound link on the site.
// This class is not set in the default CSS.
//$('a').filter(function() {
//   return this.hostname && this.hostname !== location.hostname;
//}).addClass("external");

// TOC script
// https://github.com/ghiculescu/jekyll-table-of-contents
(function($){
  $.fn.toc = function(options) {
    var tocDepth = $('#toc-depth').attr('data-toc-depth') || ''
    var defaults = {
      noBackToTopLinks: false,
      title: '<b>Contents</b>',
      minimumHeaders: 3,
      headers: tocDepth || 'h1, h2, h3, h4, h5, h6',
      listType: 'ol', // values: [ol|ul]
      showEffect: 'show', // values: [show|slideDown|fadeIn|none]
      showSpeed: 'slow' // set to 0 to deactivate effect
    },
    settings = $.extend(defaults, options);

    function fixedEncodeURIComponent (str) {
      return encodeURIComponent(str).replace(/[!'()*]/g, function(c) {
        return '%' + c.charCodeAt(0).toString(16);
      });
    }

    var headers = $(settings.headers).filter(function() {
      // get all headers with an ID
      var previousSiblingName = $(this).prev().attr( 'name' );
      if (!this.id && previousSiblingName) {
        this.id = $(this).attr( 'id', previousSiblingName.replace(/\./g, '-') );
      }
      return this.id;
    }), output = $(this);
    if (!headers.length || headers.length < settings.minimumHeaders || !output.length) {
      return;
    }

    if (0 === settings.showSpeed) {
      settings.showEffect = 'none';
    }

    var render = {
      show: function() { output.hide().html(html).show(settings.showSpeed); },
      slideDown: function() { output.hide().html(html).slideDown(settings.showSpeed); },
      fadeIn: function() { output.hide().html(html).fadeIn(settings.showSpeed); },
      none: function() { output.html(html); }
    };

    var get_level = function(ele) { return parseInt(ele.nodeName.replace('H', ''), 10); }
    var highest_level = headers.map(function(_, ele) { return get_level(ele); }).get().sort()[0];
    var return_to_top = '<i class="icon-arrow-up back-to-top"> </i>';

    var level = get_level(headers[0]),
      this_level,
      html = ('<a href="#top_of_page" id="toc-contents-header" data-title="' +
              settings.title + '">' + settings.title + '</a><'+settings.listType+'>');
    headers.on('click', function() {
      if (!settings.noBackToTopLinks) {
        window.location.hash = this.id;
      }
    })
    .addClass('clickable-header')
    .each(function(_, header) {
      this_level = get_level(header);
      if (!settings.noBackToTopLinks && this_level === highest_level) {
        $(header).addClass('top-level-header').after(return_to_top);
      }
      if (this_level === level) // same level as before; same indenting
        html += "<li><a href='#" + fixedEncodeURIComponent(header.id) + "'>" + header.innerHTML + "</a>";
      else if (this_level <= level){ // higher level than before; end parent ol
        for(i = this_level; i < level; i++) {
          html += "</li></"+settings.listType+">"
        }
        html += "<li><a href='#" + fixedEncodeURIComponent(header.id) + "'>" + header.innerHTML + "</a>";
      }
      else if (this_level > level) { // lower level than before; expand the previous to contain a ol
        for(i = this_level; i > level; i--) {
          html += "<"+settings.listType+"><li>"
        }
        html += "<a href='#" + fixedEncodeURIComponent(header.id) + "'>" + header.innerHTML + "</a>";
      }
      level = this_level; // update for the next one
    });
    html += "</"+settings.listType+">";
    if (!settings.noBackToTopLinks) {
      $(document).on('click', '.back-to-top', function() {
        $(window).scrollTop(0);
        window.location.hash = '';
      });
    }

    render[settings.showEffect]();
  };

})(jQuery);
